#include <iostream>

int main() {
  std::cout << "Enter two numbers:" << std::endl;
  int v1 = 0, v2 = 0;
  std::cin >> v1 >> v2;
  if (v1 > v2) {
    std::cout << "First number must less than second number." << std::endl;
    return 0;
  }
  while (v1 <= v2) {
    std::cout << v1 << " ";
    ++v1;
  }
  std::cout << std::endl;
  return 0;
}